If you go on Amazon and type in "Hollywood Vanity Mirror with Lights" then a bunch will pop up.
I have OP's exact mirror and it's from Chende. It says it's out of stock right now but this happened for me and I kept checking back every few days and they finally restocked it and that's when I bought it. The knob on the side is a dimmer, I love it.
The mirror is available in black, white, and "frameless" which is what OP's (and my) mirror is.